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Full text of "Monthly performance report : Helio Thermics, Inc. - lot 6"

E 1,2-8 -SOLA 12./ / 025-79/02. 



/WpM 






SOLAR/1025-79/02 




Monthly 

Performance 

Report 



HELIO THERMICS, INC. - LOT 6 
FEBRUARY 1979 



U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 






NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy nor 
any of their employees, nor any of their contractors, subcontractors, or their employees 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus product or 
process disclosed, or represents that its use would not infringe privately owned rights 



MONTHLY PERFORMANCE REPORT 

HELIO-THERMICS, INC. 
HOUSE LOT 6 

FEBRUARY 1979 



I. SYSTEM DESCRIPTION 

The Hel io-Thermics Inc., House Lot 6 is one of two instrumented single-family 
residences in Greenville, South Carolina. The home has approximately 1086 
square feet of conditioned space. Solar energy is used for space heating the 
home and preheating domestic hot water (DHW). The solar energy system utilizes 
the attic space as the solar energy collector. The attic roof faces 10 degrees 
west of south and is pitched at an angle of 51 degrees from the horizontal. 
Solar energy enters the attic through a 41 6-square-foot aperture which is 
double-glazed with corrugated, translucent, fiberglass-reinforced, acrylic 
panels. The interior of the attic is painted black to maximize the absorption 
of solar energy. Warm air accumulates in the peak of the attic roof and 
circulates through the conditioned space or through storage by an air handler. 
Solar energy is stored in an 870-cubic-foot storage bin containing 85,460 
pounds of crushed rock. The bin is located under the house and is insulated 
with 2-inch polystyrene insulation. Cold water is preheated in the attic by 
thermosiphoning water from the 80-gallon preheat tank through a manifold 
system of copper tubes. These tubes are attached to black sheet-metal plates, 
thus enhancing absorption of solar radiation for preheating the water as it 
circulates to and from the preheat tank. Preheated city water is stored in 
the preheat tank and supplied, on demand, to a conventional 80-gallon DHW 
tank. When solar energy is insufficient to satisfy the space heating load, a 
water-to-air heat exchanger in the hot air supply-duct provides auxiliary 
energy for space heating. A gas-fired water heater provides auxiliary energy 
for the water- to-air heat exchanger and DHW. The system, shown schematically 
in Figure 1, has seven modes of operation. 

Mode 1 - Col lector-to-Storage : This mode activates when there is no demand 
for space heating and the collector supply-duct temperature is 26°F higher 
than the storage temperature. This mode terminates when the temperature 
difference between the collector and storage is less than 16°F. 

Mode 2 - Storage-to-Space Heating : This mode activates when space heating is 
required (but is not available from the collector) and the storage tempera- 
ture exceeds the building ambient temperature by 5°F. This mode terminates 
when the building ambient temperature equals the storage temperature or when 
space heating is no longer required. 

Mode 3 - Collector-to-Space Heating : This mode activates when space heating 
is required and the collector supply-duct air temperature is 10°F higher than 
the building ambient air temperature. This mode terminates when the tempera- 
ture difference drops to less than 6°F or the space heating requirement is 
satisfied. 



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Mode 4 - Auxiliary Energy- to-Space Heating : This mode activates when space 
heating is required and thermal energy is not available from the collectors 
or storage. An electrical heating element in the hot air supply-duct remains 
on until the space heating demand is satisfied. 

Mode 5 - Summer Mode, Passive Cooling Storage : This mode can be activated 
when the residents wish to store cool air in storage for circulation the next 
day. The air-handler fan activates and an outside air-intake damper opens to 
allow the cool air to circulate through the attic and storage. 

Mode 6 - Summer Mode, Space Cooling : This mode can be activated when cool 
air from storage is desired in the living area. The outside air-intake 
damper closes, the duct to the living area opens, and the air-handler fan 
activates. 

Mode 7 - DHW Preheating : This mode activates when there is a demand for hot 
water. Water is drawn from the conventional DHW tank and replenished with 
heated water from the preheat tank. The DHW subsystem has this one independent 
mode of operation for preheating. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was occupied during the month of February and the solar energy system 
operated continuously during the month. The measurable solar energy satisfied 
14 percent of the space heating requirements. The solar energy system pro- 
vided fossil fuel energy savings of 1.1 million Btu. 

To prevent the possibility of water freezing in the thermosiphoning subsystem, 
this solar energy system component (located in the attic) has been drained 
until warmer weather. 

In this report the space heating load represents data from the last 14 days of 
February which was used and extrapolated to reflect the entire month. Because 
the average ambient temperature for the last 14 days was 43°F and the average 
for the first 14 days was 33°F, a significant bias has been introduced to some 
monthly totals. However, the data will provide some insight into solar energy 
system performance. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 13.3 
million Btu for a daily average of 1146 Btu per square foot. This was below 
the estimated average daily solar radiation for this geographical area during 
February of 1715 Btu per square foot for a south-facing plane with a tilt of 



4240 



51 degrees to the horizontal. The average ambient temperature during February 
was 38°F as compared with the long-term average for February of 44°F. The 
number of heating degree-days for the month (based on a 65°F reference) was 
757, as compared with the long-term average of 577. 

THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for the 
month of February was 13.3 million Btu. During the period the collector loop 
was operating, the total insolation amounted to 9.4 million Btu. The total 
collected solar energy for the month of February was 2.7 million Btu, result- 
ing in a collector array efficiency of 20 percent, based on total incident 
insolation. Solar energy delivered from the collector array to storage was 
2.0 million Btu. Energy loss during transfer from the collector array to 
storage and loads was 0.19 million Btu. This loss represented 7 percent of 
the energy collected. Operating energy required by the collector loop was 
0.18 million Btu. 

Storage - Solar energy delivered to storage was 2.0 million Btu. There were 
0.20 million Btu delivered from storage to the space heating subsystem. 
Energy loss from storage was 1.7 million Btu. This loss represented 82 per- 
cent of the energy delivered to storage. This "lost" thermal energy is proba- 
bly entering the living area and contributing to the lower-than-expected space 
heating load. The predicted space heating load based upon actual ambient 
temperature was 5.7 million Btu, considerably higher than the actual load of 
2.9 million Btu. The storage efficiency was 18 percent: This is calculated 
as the ratio of the sum of the energy removed from storage and the change in 
stored energy, to the energy delivered to storage. The average storage tempera- 
ture for the month was 64°F. 

DHW Load - The DHW load was 2.4 million Btu, of which there was no solar 
contribution because the thermosiphoning subsystem was drained. A daily 
average of 91 gallons of DHW was consumed at an average temperature of 153°F 
delivered from the DHW tank. 

Space Heating Load - The space heating subsystem consumed 0.68 million Btu of 
solar energy and 4.1 million Btu of auxiliary fossil fuel energy to satisfy a 
space heating load of 2.9 million Btu. This space heating load total reflects 
the bias introduced by using the last half of the February data as the basis 
for computing the monthly total. The solar fraction of this load was 14 per- 
cent. The space heating subsystem consumed a total of 0.58 million Btu of 
operating energy in order to distribute both solar energy and auxiliary thermal 
energy. 

OBSERVATIONS 

The instrumentation anomalies which created the need to extrapolate data have 
been corrected as a result of a site visit by IBM on February 14. Although 
unrelated, it was observed on February 16 that the gas totalizer used to 



4240 



quantify the gas consumption is not providing valid data. The measurement of 
auxiliary thermal energy consumption in the DHW subsystem will not be available 
until this problem is corrected. 

ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 1.1 
million Btu. 



III. ACTION STATUS 

Boeing will schedule a site visit in the near future in order to correct the 
erroneous gas totalizer data readings. 



424 



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